Machine for pointing and threading bolts



3 Sheets-Sheet 1.

Patented May 13, 1890.

A. J. BRAUNW MAOHINE FOR POINTING AND THREADING BOLTS.

(NoModeL) "m: Ncnms PETUIS 00., mom L mo u 'ur (No Model.) 3 Sheets-Sheet 2. A. J. BRAUN. MACHINE FOR POINTING AND THREADING BOLTS. I No. 427,732. Patented May 13, 1890.

' (No Model.) a Sheets-Sheet a.

A. J. BRAUN. MAOHINE FOR POINTING AND THRBADING BOLTS.

No. 427,732. Patented May 13, 189 0.

ummm UNITED STATES PATENT @EErcE.

AUGUST J. BRAUN, OF PITTSBURG, PENNSYLVANIA.

MACHINE FOR POlNTlNG AND TH READlNG BOLTS.

SPECIFICATION forming part of Letters Patent No. 427,732, dated May 13, 1890.

. Application filed November 29, 1889- Serial No. 331,879. (No model.)

T0 at whom it may concern.-

Be it known that 1, AUGUST J. BRAUN, a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Apparatus for Pointing and Threading Bolts; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to the pointing and threading of bolts, its object being to provide a form of apparatus in which the blank is pointed and threaded by the use of one set of dies without the necessity of removing or changing the position of said blank until the finished bolt is produced.

My invention comprises a form of apparatus in which the blank is fed to a set of revolving screw-'th reading dies and at the same time to a pointing-knife adapted to revolve with said threading-dies, and mechanism for withdrawing said knife when the blank has been pointed, while the threading operation may continue until the blank has been threaded the required amount.

My invention comprises, further, certain improvements and combination of parts, all of which will be more fully hereinafter setforth and claimed.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the accompanying drawings, in which- Figure 1 is aside view of myimproved machine, showing the blank in position for the pointing and threading operation. Fig. 2 is a plan view showingthe position of the parts when the blank has been pointed and partly threaded. Fig. 3 is a plan view of the feeding device, showing the gripping-jaws open. Fig. l is an enlarged view of the rear portion of the machine, showing the threading-dies open. Fig. 5 is an enlarged longitudinal section of the hollow spindle, showing knifecarrier therein. Fig. 6 is an enlarged section of knife-carrier. Fig. 7 is a cross-section on the line 7 7, Fig. 2. Fig. 8 is a cross-section on line 8 8, Fig. 2. Fig. 9 is a face view of the die-head,showingposition of knife. Fig. 10 is a modified form of knife-carrier, and Fig. 11 is a view of the means of operating the sliding plate of the feeding device.

Like letters indicate like parts.

The whole apparatus may be mounted upon any suitable frame, that shown in the drawin gs being well suited for the purpose. It consists in the frame A, supported by the standards A, with a box or pan A situated at the forward end of the frame A. Journaled in cross-bars A of the frame is the central driving-shaft a, having the pulley a thereon, which, being connected by means of a belt to a power-driven shaft, revolves said shaft a.

A pinion a on the shaft a gears with a pinion Z), mounted on the hollow spindle 1). Though several of these spindles together with the threading and pointing devices may be mounted on the same frame and operated from the single shaft Ct by proper gearing, I will confine my description to the operation of a single device. The hollow spindle Z) is journaled in the cross-bars A of the frame and has secured thereto the circular die-head 0. Around this circular die-head c are arranged the seats 0', and within said seats are pivoted the levers cl by the pins or bolts (1. The rear portions of the levers (t are slightly inclined, as at d, and at the forward end of said levers are the seats (1, within which the threading-dies e are secured by set-screws. Only two of these levers 61, carrying the threading-dies e, are shown, although four may be used, if necessary. The threadingdies 6 have the threading-jaws c and the recesses 6 formed therein, said recesses 6 extending beyond the jaws 6 so that when the dies are in position these recesses Q will be opposite each other for the reception of the blade of the pointing-knife, as shown in Fig. 9. A band-spring (l surrounds the circular die-head c at its rear portion and tends to force the rear portions d? of the levers (Z -toward each other, while the other ends, carrying the dies 6, are forced apart.

Directly back of the die-head 0 upon the hollow spindle I) is the double elutch-conef, consisting of two distinct parts, which willbe hereinafter termed the threading-cone and knife'clutch, respectively. These parts are adapted to revolve with the hollow spindle I), being secured thereto by the feather which engages with corresponding grooves formed within the double clutchconef, while said parts have also a longitudinal movement back and forth on the hollow spindle. The threading-cone g has the cone-face g, which serves, when in engagement with the inclined portions (1 of the lovers (1, to force the threading-dies 6 toward each other. The threadingcone g has also the clutch-face g and the annular groove 9 The knife-clutch 72, forms the second part of the double clutch-cone f, and when in connection with the threadingcone 9 a clutch-face 71' engages with the clutch-face g of said threading-cone g. An annular groove 72 is also formed upon the knife-clutch 71.

Within the hollow spindle Z) is the knifecarrier 2', said knife-carrier, as shown in Fig. 6, consisting of the spindle t", threaded at or near its ends, a sleeve "i fitting on one end, and a knife-holder 2' on the other end, said knife-holder having a suitable seat therein, within which the pointing-knife 2' is secured by means of the set-screw The knifeholder 2' has the groove t formed thereon, which engages with the feather 1) within the hollow spindle, whereby the knife-carrier t' revolves with said hollow spindle and at the same time has a longitudinal movement therein. Interposed between the sleeve t and a. collarj upon the spindle z" is the coiled springj. Then the knife-carrier 'i is in position withinthe hollow spindle b, a pin or bolt 7c passes through the knife-clutch 72., through a slot in the hollow spindle b, and finally through the slot 7t, formed in the spindle z", and so connects the knife-cone 7L with the knifecarrier t.

In orderto increase the tension of the spring j, a set-screw 3' passes through the knifeholder 1' and presses against a pin j in the collar j, which extends through a slot j in the spindle i, so that by tightening up said setscrew the collar j is forced back along the spindle 11 compressing the spring j against the pin or bolt k. A forked arm Z engages with the annular groove 7L2 of the knife-clutch h, said forked arm being bolted to or cast integral with the rocking lever Z. The rocking lever Z is pivoted on a suitable stud or bearing Z extending out from the frame A. In the rear of the rocking lever Z and in line therewith is the pivotal arm m, resting in a slot m or other suitable guide in the frame A and adapted to be clamped at any point Within said, slot by the set-screw m Pivoted to the pivotal arm m is the lever 72, upwardly inclined at its forward end and having the shouldcrn thereon, adapted to engage with the shoulder Z of the rocking lever Z. A rod 0, which will be hereinafter termed the knife-clutch rod, passes through openings in the rocking lever l and the end wall A of the box A and extends to the feeding device,

in which it is properly journaled, as will more fully hereinafter appear. On the rear end of the knife-clutch rod 0 is the lug 0, and between the rocking lever Z and the wall A is interposed the coiled spring 0 The lug 0 serves to raise the lever 71 to release the shoulder at from engagement with the shoulder Z of the rocking lever Z when the knifeclutch rod 0 moves toward the lever n, the spring 0 acting to throw back the rocking lever.

The device for feeding the blank to the threading-dies is situated within the box A and in line with the threading-dies. This device consists of the standards 29, having bearings therein for supporting the knife-clutch rod 0, the guides 19', secured to said standards 1), and the sliding plate 13 arranged to move back and forth in said guides. A slot 13 is formed in the sliding plate 19 and clamped within said slot at any desired point therein is the plate q. Levers q, similar to the levers d in the die-head c and carrying the grippingjaws (1 are pivoted to the forward end of the plate g by pins (1 which pass down through a cross-piece qfisecured to the plate q. When the levers q are pivoted in place, the gripping-jaws will face each other and are arranged to receive the head of the blank to be threaded.

In order to hold the blank securely in place during the pointing and threading operation, it is necessary for theinner ends of the levers q to be held apart, which will act to force the gripping-jaws g into contact with the head of the blank. For this purpose pins or studs 7, secured to the inner ends of the lever q,

extend up through the slots r in the guidepiece W, said guide-piece having no movement with the sliding plate 19 being secured to the guides 19. A cone-shaped lug is cast on the inside of the guide-piece 1' between the slots r and serves to assist in guiding the levers q. From this construction it is apparent that when the pins 4" are in the parallel portions of the slots 1'' the gripping-jawsg will be forced into contact with the head of the blank; but when the plate (1 recedes the pins 0" will travel back in the slots 7', asshown in Fl 3, and as soon as they reach the curved port-ions of said slots the ends of the levers q will be drawn toward each other, releasing the blank from the gripping-jaws and allowing it to drop therefrom.

' Secured to the sliding plate 19 is the bearing-piece s, the lower portion of said bearingpiece having the bearing .9, through which the knife-clutch rod 0 passes, being secured therein by a set-screw. By this arrangement of parts the knife-clutch rod 0 moves with the sliding plate 19 back and forth.

Above the bearing .5 on the hearing-piece s is the guide I, through which the threadingcone rod 15 passes. Collars t t are arranged on the threading-cone rod t, one on each side of the guide 75, and may be held at any distance therefrom by set-screws. A forked lever 11. is secured to the threading-cone rod t at a point thereon opposite to the annular groove g of the threading-cone g, the forked portion of said lever fitting in said annular groove, so that. any longitudinal movement imparted to the threading-cone rod t will carry the forked lever to in the same direo tion, together with the threading-cone. The sliding plate 12 may be moved back and forth by the hand-lever i), said lever 1) being pivoted to the'lug o, and said lever 1) having the slot 0 therein, into which the pin or stud 0 enters, secured to the sliding plate 19 \Vhen the lever 12 is thrown forward, the sliding plate 13 will advance toward the threadingdies, while the double clutch f will be thrown back on the hollow spindle b.

In Fig. 10 a modified form of knife-carrier is shown. This carrier consists of the block w, which is adapted to be dovetailed in one of the seats a not occupied by the lovers cl. A seat is formed in the lower part of the block to for the reception of the knife-holder 10, said knife-holder having a knife therein, braced and strengthened from upward movement by the brace 10 having the slotjw therein, and a set-screw entering said slot in order to clamp the brace 10 to the block 10. A set-screw w acts to force down the brace 10 when turned in the proper direction. Pivotcd on the back of the block to is the lever 00, one end of said lever being in contact with the block 20 and the other end forced therefrom by the spring 00. Pivoted toalug y on the upper end of the block to is the lever y, said lever being again pivoted to the die-head c at if, and, extending back, is secured to the strap ,2. The strap z is pivoted to a lug .2 on the clutch-face of the knifeclutch h. lVhen'in position, the knife will be between the threading-dies e, and the operation of pointing will be the same as with the use of the other carrier. However, when the blank has been pointed, instead of the knife being drawn within the hollow spindle it will be drawn vertically from between the threading-dies e, for as the knife-clutch 71, is thrown back the rear end of the lever 31 will be drawn down and the block 10 will be raised in its seat, carrying with it the knife. By the employment of this form of knife-carrier it is obvious that I can dispense with the use of a hollow spindle.

For the operation of pointing and threading a blank of a given size the several parts of my improved machine are first arranged in relation to each other by means of the different set-screws so that the pointing and threading operation will continue for such a length of time as may be necessary to produce the point and desired amount of threads upon the blank. The several parts, therefore, having been adjusted, and it being desired to insert the head of the blank within the jaws Q2 of the levers q, as shown in Fig. 1, the lever 11 is first drawn back, which causes the sliding plate 19 to recede. Through this movement imparted to the sliding plate 1) the pins 7' on the levers q will travel back into the curved portions of the slots 0', as shown in Fig. 3, when the jaws will be forced apart suilicicntly to allow the head of the blank to be inserted. \Vhen the head of the blank has been inserted within the jaws g the lever 12 is shoved forward until the sliding plate 19 advances and resumes its former position,with the pins 0 just entering the parallel portions of the slots 1' when the jaws will be forced into contact with the head of the blank and hold it securely in place. It will be observed that in operating the lever o for the opening and closing of the jaws g the sliding plate 19 was not moved far enough forward to act to operate the knifeclutch rod 0 or the threading-cone rod t, which would result if the levero were thrown still farther forward. The end of the blank to be pointed will now be in the position shown in Fig. 1 within the jaws e of the threading-dies e. Power is applied to revolve the shaft C6 and through the pinions (t l) to the hollow spindle b. The threading of the shank of the blank now commences, and as the said blank is held stationary and the threadingdies e, together with the knife-carrier i, revolve with the hollow spindle b, the end of the blank is forced into the jaws of the threading-dies and into contact with the pointing-knife 2'. WVhile the pointing operation is going on the threading-dies e are also at work upon the shank of the blank, forming the threads thereon, and the blank is fed farther into the jaws of the threading-dies, consequently forcing the end of the blank with increasing pressure against the blade of the pointing-knife i The amount of resistance which the knife 2' can bring to bear against the force of the blank fed to it is regulated by the tension of the spring j, which may be increased or diminished by turning the screw j in the proper direction. The blank gradually overcomes the resistance of the spring j and the knife-carrier is forced into the hollow spindle b, the pin 71?, which connects the knife-clutch h with said knifecarrier, moving forward in the slot and thereby contracting the springj'by forcing it against the collar 3'. Meanwhile the sliding plate 19 has been advancing in its guides toward the threading-dies carrying with it the knife-clutch rod 0, until the lug 0' comes in contact with the lever n, and by raising said lever disengages the shoulder 07. from the shoulder Z of the rocking lever Z, as shown in Fig. 4. The spring 0 is allowed to expand and acts to throw back the rocking lever Z, together with the knife-clutch h, moving on the hollow spindle Z), and the knife carrier t' within said hollow spindle. The knife t is in this way withdrawn from contact with the blank, and the further threading of the shank of the blank may be continued for a period to be regulated by the position of the collars t 15 upon the threadingcone rod it. These collars t t are so adj usted by means of the set-screws that as the sliding plate 11 advances the guide if will not reach the collar! until the knife-clutch rod 0 has operated to throwback the knife-clutch h and knife-carrier 1', or for such a length of time thereafter as may be required for the ITS further threading of the blank. This may be accomplished by moving the collar t forward on the rod 15. As soon, therefore, as the guide it, moving with the sliding plate 19 comes in contact with the collar 25 it will carry the threading-cone rod t with it. This movement on the part of the rod t in connection with the forked lever u will throw back the threading-cone g, when the bandspring d will act to draw in the end portions of the levers cl and force apart the threading-dies e to release the shank of the blank. In order to release the head of the blank, which has been held securely in place during the threading operation, and to allow the finished bolt to drop to a suitable receptacle below, the lever o is drawn back until the pins 0 travel back into the curved portions of the slots 1", Fig. 3,when the gripping-jaws (1 will be opened and the head released. In drawing back the lever o still farther, and with it the sliding plate 13 the rods t and 0 travel back in the same direction until the threadingcone 9 and knife-clutch h connected thereto resume their former position to form the double clutch-cone f and the threading-dies c are closed. Thelevern drops down and the shoulder a engages with the shoulder Z of the rocking lever Z to hold the knife-cone h in position. The knife-carrierz' will also resume its former position with the knife in position for another pointing operation. Another blank is then inserted in the gripping-jaws Q2 and the lever 12 forced forward to close said gripping-jaws q around the head of said blank, when the same operation of pointing and threading is repeated.

By the above-described method and apparatus the pointing and threading of the blank may be carried on without the necessity of removing the blank or changing its position until the finished bolt is produced.

It is readily apparent that the several parts of the machine may be adjusted by the different set-screws, according as it is desired to reduce or increase the sharpness of the point of the bolt or the amount of threads on the shank.

lVhat I claim as my invention, and desire to secure by Letters Patent, is-

1. In a machine for pointing and threading bolts, the combination of a set of revolving screw-threading dies, a pointing-knife in line with said threading-dies and revolving therewith, and mechanism for drawing back the pointing-knife from the blank when the blankhas been pointed, substantially as and for the purposes set forth.

' 2. In a machine for pointing and threading bolts, the combination of a set of revolving screw-threading dies, a pointing-knife between the jaws of said threading-dies and revolving therewith, a device for feeding the blank to said threading-dies and pointing knife, and connections between said feeding device and pointing-knife, whereby said knife is drawn back from the blank when the blank from the blank and afterward the jaws of the threading-dies opened to release the finished bolt, substantially as and for the purposes set forth.

4. In a machine for pointing and threading bolts, the combination, with a revolving spindle, of a die-head secured thereto carrying threading-dies movable thereon, a pointingknife, a double clutch-cone mounted 011 said spindle, one part thereof being connected to the threading-dies and one part to the pointing-knife, a device for feeding a blank to the threading-dies, and connections between said double clutch-cone and feeding device for sliding said double clutch-cone back and forth on the revolving spindle, substantially as and for the purposes set forth.

5. In a machine for pointing and threading bolts, the combination,with a revolving spindle, of a die-head carrying threading-dies and a pointing-knife, and a double clutchcone mounted on said spindle and revolving therewith, said double clutch-cone consisting of a threading-cone and knife clutch engaging with each other by clutch-faces and adapted to move independently of each other upon said spindle, substantially as and for the purposes set forth.

(i. In a machine for pointing and threading bolts, the combination, with a revolving spindle, of a die-head carrying threading-dies and a pointing-knife, a double clutch-cone on said revolving spindle, said double clutch-cone consisting of a threading-cone and knifeclutch, and separate connections between said threading-cone and knife-c111 tch, whereby said threading-cone and knife-clutch maybe moved back and forth on the spindle independently of each other, substantially as and for the purposes set forth.

7. In a machine for pointingbolts, the combination, with a hollow revolving spindle, of a clutch mounted thereon and revolving therewith, a knife-carrier secured within said hollow spindle, connections between said. knifecarrier and said clutch, and mechanism for drawing back said knife through said clutch, substantially as and for the purposes set forth.

8. In a machine for pointing and threading bolts, the co1nbination,with a revolving spindle, of a die-head carrying threading-dies, mounted on said spindle and revolving therewith, a double clutch-cone secured to said spindle, one part thereof engaging with the threading-dies and the other with the pointing-knife, a feeding device, and connections between the threading-cone of said double clutch and said feeding device, whereby said threading-cone may be moved back and forth to operate the threading-dies independently of the knife-clutch, substantially as and for the purposes set forth.

9. In a machine for pointing and threading bolts, the combination, with a revolving spindle, of a die-head carrying threading-dies and mounted upon said spindle, a double clutchcone on said spindle, one part of which engages with the threading-dies, the other part being connected to the knife-carrier, a lever engaging with the knife-clutch and pivoted to the machine-frame, a shouldered lever ongaging with said clutch-lever, and a longitudinally-moving rod engaging with said shouldered lever and acting to disengage it from said clutch-lever, substantially as and for the purposes set forth.

10. In a machine for pointing and threading bolts, the combination, with a spindle, of a die-head carrying threading-dies and mounted on said spindle, a double clutch-cone on said spindle, one part of which engages with the threading-dies, the other part being connected to the knife-carrier, a lever engaging with the knife-elutch and pivoted to the machine-frame, a shouldered lever engaging with said clutch-lever, and a longitudinally-moving rod passing through said clutch-lever and engaging with said shouldered lever, and a spring confined between said shouldered lever and the machine-frame and act-in g to force back said knife-clutch, substantially as and for the purposes set forth.

11. In a machine for pointing and threading bolts, the combination of a hollow revolving spindle having a die-h ead thereon, a knife-carrier moving longitudinally within said hollow spindle and having aslot therein, a knifeelutch on said hollow spindle and connected to said knife-carrier by a pin passing through said slot, and a spring confined between said pin and the forward end of the knife-carrier, substantially as and for the purposes set forth.

12. In a machine for pointing and. threading bolts, the combination of a hollow revolving spindle havingadie-head thereon, almife-carrier moving longitudinally within said hollow spindle and having a slot therein, a knifeclutch on said hollow spindle and connected to said knife-carrier, a pin passing through said slot, and a spring confined between said pin and an adjusting-collar on the forward end of said knife-carrier, and a screw within said knife-carrier for adjusting said collar and regulating the tension of the spring, substantially as and for the purposes set forth.

13. In a machine for pointing and threading bolts, the combination of a rotating head earrying threading-dies therein, said threadingdies having grooves formed therein, and a pointing-knife entering within said grooves and between the threading-jaws of the threading-dies, substantially as and for the purposes set forth.

14. In a machine for pointing and threading bolts, a feeding device consisting of the standards p, the lever c, stud e sliding plate 13 the plate q, secured thereto, the levers q, pivoted to said plate and carrying gripping-j aws g and the pins '1', traveling in the slots 0', formed in the fixed guide-piece r substantially as and for the purposes set forth.

In testimony whereof I, the said AUGUST J. BRAUN, have hereunto set my hand.

AUGUST J. BRAUN.

Witnesses:

J. N. CooKE, RoB'r. D. TOTTEN. 

